Computer-aided inspection

CAI machines can use a variety of technologies depending on the material of the product to be inspected, the properties to be measured, and the precision required.

Digital cameras are frequently used in situations where the shape or colour of an object needs to be analysed.^[3] Using machine vision, the CAI program can make decisions about objects by comparing them to a master photo or data array.

Laser scanning CAI machines use point clouds to generate a 3D model which is compared to the required specification.^[4] Laser scanners are generally used to check the external geometry of parts with low reflectivity and translucence.

Structured light scanners use projected light patterns and digital cameras to analyse the geometry of an object.^[5] As with laser scanning, objects with high reflectivity and translucence can cause problems but temporary coatings can be applied to prevent this.

Industrial CT scanners use X-rays to image an object from many angles, building up a 3D image to compare to a specification.^[6] CT scans can be used to analyse the internal geometry of parts because the X-rays penetrate the object being scanned. Higher resolution CT scans can also check for cavities, cracks, and other undesirable features inside parts.

• Computer-aided design
• Computer-aided manufacturing
• Coordinate-measuring machine